JPH08300269A - Torque transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of transmitting torque generated by a hand tool driving device, to a tool to the maximum in the tool and a tool storage part corresponding to the tool. SOLUTION: An insert shaft 2 of a tool 1 insertable in a tool storage part 5 is provided with axially extending transmission side faces 31, and the transmission side faces 31 are fitted to opposed side faces 6 formed at the tool storage part. A device 4 acting in linkage being engagedly fitted to a fixing device 7 provided at the tool storage part 5 to retain the tool 1 is provided at the insert shaft 2 to make the tool 1 axially displaceable within a limited range. At least one recess is formed at the device provided at the insert shaft 2 of the tool 1, and at least one locking element 8 provided corresponding to the tool storage part 5 so as to be radially and axially displaceable to a limited extent acts in linkage with the recess to make the tool 1 axially displaceable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a tool that can be inserted into a tool accommodating portion, and a transmission side surface that extends in the axial direction is provided on the insertion shaft of the tool so that the transmission side surface corresponds to the tool accommodating portion. The insertion shaft is provided with a device that engages with the formed opposing side surface to perform an interlocking operation, and engages with a fixing device provided in the tool housing to hold the tool, and the fixing device provides a limited range of the tool. The present invention relates to a torque transmission device capable of moving in the axial direction.

[0002]

2. Description of the Prior Art The tool and the tool housing of a hand tool device, in particular a striking or drilling tool, must be matched to one another. The tool and the tool housing of the hand tool device comprise a device for transmitting the torque produced by the drive of the device. Further, there is provided a fixing device for preventing movement of the tool inserted in the tool accommodating portion in the axial direction. To transmit torque, the insert shaft of the tool is provided with a rotation transmitting side. In order to fix the axial movement of the tool, the insert shaft is provided with a notch extending in a limited axial direction. The rotation transmitting side surface engages with the opposing side surface formed corresponding to the tool accommodating portion so as to cooperate with each other, and the torque generated by the driving device is transmitted to the tool. The locking body provided on the tool is engaged with the notch of the insertion shaft to prevent the tool from coming out of the tool accommodating portion. This locking body
It is fixed in the tool housing in the axial direction. By axially extending the notch in the insert shaft of the tool, the drive allows the tool to move axially within a limited range.

[0003]

Some known torque transmission devices for hand tools lose their torque transmission function in the area of the insert shaft, which is provided with a notch extending axially in a limited range for axial retention of the tool. Will be seen. However, there is a desire to maximize the torque generated by the drive of the hand tool device to the tool. It is generally impossible to increase the number of transmission side faces by providing notches extending in the axial direction within a limited range at the bottom of the rotation transmission groove. That is, the depth of the rotation transmitting groove is optimized by simultaneously fixing a sufficiently large tool diameter with respect to preparing a torque transmitting side surface as large as possible. By providing a notch within the limited range in the axial direction at the bottom of the rotation transmitting groove, the cross section of the tool is further reduced, so that the diameter of the tool is excessively reduced, and the area where such a diameter is reduced becomes a tool. It doesn't work. Furthermore, by providing the insertion shaft with the number of rotation transmission grooves that is preferable for transmitting the torque well, the width of each rotation transmission groove can be reduced,
Make the size of the portion assigned to the locking element sufficiently large. Depending on the arrangement at the groove bottom, the strength of the groove's transmitting side surface is reduced in any case.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a device in a tool of a hand tool and a tool housing corresponding to the tool, which is capable of maximally transmitting to the tool the torque generated by the drive device of the hand tool. . Also, excessive strength reduction of the tool, in particular of the insert shaft, should be reduced and the resulting deterioration of the tool should be avoided. At the same time, a limited range of axial movement of the tool inserted in the tool housing should be maintained. Furthermore, the tool should be easy to insert into the tool housing and there should be no risk of inserting the rotation transmission part and the axial fixing part by mistake. Furthermore, the tool is simple in construction and manufacture, in order to obtain a device which avoids tedious manufacturing methods.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention comprises a tool which can be inserted into a tool housing, the insert shaft of the tool being provided with a transmission side surface extending in the axial direction. A side surface is engaged with an opposing side surface formed corresponding to the tool accommodating portion so as to perform an interlocking operation, and a device for interlocking operation is engaged with a fixing device provided in the tool accommodating portion so as to hold a tool on the insertion shaft. In this torque transmitting device, wherein the fixing device allows the tool to move in the axial direction within a limited range, at least one recess is provided in the device provided on the insertion shaft of the tool, and this recess corresponds to the tool accommodating portion. Associated with at least one locking element that allows radial movement within a limited range and axial movement within a limited range. To so that, characterized in that to allow axial movement of the tool by axial movement capability in the limited range of the locking element.

[0006]

With the arrangement according to the invention of the tool and the tool housing of the hand tool device, it is possible to increase the side of torque transmission assigned to the insert shaft.
For axial fixing of the tool, it is only necessary to provide the insert shaft with one small recess, which is provided in a very small area of the insert shaft. All the remaining area of the bayonet shaft can be assigned to torque transmission, and more torque can be transmitted to the tool than in known torque transmission devices. Since the recess is relatively small, there is less loss of strength in the tool in the recessed area of the bayonet shaft. Axial movement of the tool inserted in the tool housing within the limited range is still possible. Providing a recess in the bottom of the transmission groove of the bayonet shaft reduces the cross section of the bayonet shaft slightly. By providing the depression in the region of the rotation transmission groove of the bayonet shaft, a reduction in the cross section can be avoided. A limited range of axial movement of the tool inserted into the tool housing is associated with at least one locking element provided in the tool housing corresponding to the recess of the insert shaft by engaging the recess of the insert shaft. This is because the locking element is capable of performing a limited range of radial and axial movement. The axial movement of the tool is partly enabled by the limited extent of axial movement of the locking element.

According to the present invention of the tool and the tool accommodating portion of the hand tool device, the tool is prevented from being imperfectly inserted into the tool accommodating portion. On the other hand, from the tool of which the position of the mechanism is known and the tool accommodating portion related to this tool, the tool area provided with the transmission side surface and the area where the tool is fixed in the axial direction are not made the same configuration. The insertion of the tool into the tool housing is simple and the tool can be inserted at different angular positions depending on the number of recesses in the insertion shaft. The formation of the recess on the insert shaft of the tool is very simple and can be formed, for example, by cutting or cold deformation, in particular by cold rolling. These forming methods are simple, low in cost, and mass production of tools is extremely advantageous.

In a preferred embodiment of the present invention, the recess of the insertion shaft is provided so as to extend in the axial direction, and the locking element is also provided so as to extend in the axial direction. With this configuration, the area that may be lost as a torque transmission side surface due to the depression in some cases can be kept small. A limited range of axial movement of the tool inserted in the tool housing is ensured by a limited range of axial movement of the locking element.

It is advantageous if the recess is provided on the side of the insert shaft opposite to the insert end and in the front region of the insert shaft at the insert position of the tool in the opening region of the tool housing. Furthermore, it is expedient if a recess is provided in the front half of the insert shaft with respect to the working area of the tool. In this embodiment, it is also possible to transfer the transfer flank in the direction of the working area of the tool. With this configuration, the torsion length, which is the distance between the transmission side surface and the tip of the tool where the blade is present, can be kept small, which allows the introduction of impact energy to the insertion end of the insertion shaft of the tool. Works well.

Further, in a preferred embodiment of the present invention,
At least two recesses are provided, each of these recesses being semicircular and equidistant from one another in the circumferential direction of the insert shaft of the tool. According to this configuration, the tool can be inserted into the tool accommodating portion at different angular positions according to the number of recess pairs provided on the insertion shaft so as to be diametrically opposed to each other, and at least one depression is provided in the tool accommodating portion. It engages with the locking element of and operates in cooperation.

Providing one recess on each transmission side makes it easier to insert the tool into the tool housing. The number of recesses provided on the tool shaft corresponds to the number of transmission side surfaces,
A single locking element provided in the tool housing allows the tool to be inserted at a corresponding number of angular positions. This means that the formation of each depression requires only a small burden and the possibility of deformation of the depression is reduced.

If the recess is provided along the circumference of the insertion shaft and the recess is formed as an annular groove, the allowable insertion direction of the tool is simply the position of the transmission side surface of the insertion shaft and the position of the opposite side surface of the tool accommodating portion. Will depend on and.

Further, in a preferred embodiment of the present invention,
The transmission side surface provided on the insertion shaft is formed by a ridge or a groove, and the transmission side surface extends substantially perpendicular to the outer surface of the insertion shaft, and the transmission side surface is provided with a recess or an annular groove. The ridges or grooves provided on the insert shaft of the tool can be easily formed. In this case, the facing side surfaces are provided as grooves or ridges in the tool housing, but these grooves or ridges can also be easily formed. Torque transmission occurs along the entire length of the transmission side surface and the opposing side surface that engage each other.

Further, in a preferred embodiment of the present invention,
The locking surface of the locking element that engages with the annular groove is shaped to fit the cross section of the annular groove so that the locking surface abuts at least two ridges or grooves. The locking element thus formed is generally of asymmetrical shape, which ensures that slipping out of the holding can be avoided. The locking surface of the locking element and the corresponding locking surface of the recess can be very small. The locking element is preferably made of hard metal.

In order to introduce the force by the torque transmission, it is preferable that the angle formed by the transmitting side surface of the ridge or groove with respect to the radial plane of the ridge or groove is about 15 ° to about 60 °. As a result, the component of the force to be introduced is distributed into the component orthogonal to the force transmitting side surface and the component parallel to this force transmitting side surface, and the component parallel to this force transmitting side surface brings about the centripetal effect. is there. This centripetal action is further enhanced by providing the ridge or groove with a second side surface and making the second side surface form a larger angle with the radial plane of the ridge or groove than the transmission side surface. . When viewed in cross section of the bayonet shaft, the ridges or grooves thus formed have an asymmetric sawtooth shape.

In another preferred embodiment of the invention, the insert shaft is provided with the ridges or grooves such that the outer contour of the insert shaft is sinusoidal. Correspondingly, the opposite side surfaces formed in the tool accommodating portion also have the same sinusoidal cross section. The transmission side surface and the opposing side surface of the tool accommodating portion formed in this way transmit a sufficient force without shearing force. As a result, friction losses are avoided and the wear on the transmission side of the insert shaft and on the opposite side of the tool housing can be kept very low. The sinusoidal shape avoids cracking. The cross-sections of the insert shaft and the tool housing can be modified in sinusoidal shape, for example by flattening the sinusoid in the area of the maximum diameter of the rotation transmitting part to create a dead space in the insert position of the insert shaft of the tool. To This dead space has a function of accumulating mud and can store dirt. The sinusoidal deformation can also define a guide side between the bayonet shaft and the tool housing.

Further, in a preferred embodiment of the present invention,
The insertion shaft is provided with an odd number of transmission side surfaces, and correspondingly, the tool housing portion is provided with the same number of opposing side surfaces. When the diameter of the insertion shaft is about 10 mm, five transmission side surfaces or opposing side surfaces are provided. When the diameter of the shaft is about 10 mm to about 15 mm, 7 transmission side surfaces or opposing side surfaces are provided, and when the diameter of the insertion shaft is about 15 mm or more, 11 transmission side surfaces or opposing side surfaces are provided. Due to the number of these transfer flanks and the corresponding counter flanks, the region carrying the transfer flanks or the counter flanks of the tool or tool housing is of a sufficiently stable construction, depending on the tool diameter involved.
Similarly, the transmission side surface for performing torque transmission can be enlarged. The odd number of transmission side surfaces and the opposite side surfaces are also advantageous in terms of vibration suppression technology. By making the shape slightly asymmetric, the force transmission to the tool tip provided with the blade is changed, which has an advantageous effect on the disassembling operation.

[0018]

The preferred embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a first exemplary embodiment of the device according to the invention for transmitting torque. This device has a tool 1 and a tool housing 5 which is a part of a hand tool device (not shown). This drawing shows the tool 1 with the insert shaft 2 mounted in the tool housing 5. The insert shaft 2 of the tool 1 is provided with a rotation-transmitting side surface 31, which corresponds to a corresponding tool housing 5 arranged to transmit the torque generated by the electric drive of the hand tool device to the tool 1. It engages with the side surface 6 and operates in coordination. In the illustrated embodiment, the rotation transmitting side surface of the insertion shaft 2 is constituted by the rotation transmitting groove 3, and the corresponding engaging protrusion of the tool accommodating portion 5 is fitted into the rotation transmitting groove 3. The tool 1 is provided on the insert shaft 2 with a device 4 arranged to cooperate with a fixing device 7 of a holding device which allows the tool 1 to move within a limited range in a tool housing 5. In the example shown, this device 4 in the bayonet shaft 2 is preferably configured as a small semicircular recess. The fixing device 7 of the tool accommodating portion 5 is preferably one,
A spherical locking element 8 is provided, and the locking element 8 is held in a block-shaped housing 9 for the locking element. This receiving part 9 is able to move together with the retaining element 8 which it holds in an axially restricted range in a groove 13 extending in the axial direction.
The axial length of the groove 13 is larger than the axial range of the recess 4 of the insertion shaft 2. Correspondingly, the axial movement of the locking element 8 is caused by the recess 4 of the insert shaft 2.
Larger than the axial range of. In order to enable movement of the accommodating portion 9, protrusive ears 10 extending in the axial direction are provided in a region of the accommodating portion 9 opposite to the insertion shaft 2 side, and these protrusive ears 10 are provided on the outer surface 11 of the tool accommodating portion 5. It is made to be slidable in the axial direction in the slit-shaped notch 12 formed in. A holding sleeve 14 is provided in the region of the cutout 12 on the outer side surface 11 of the tool housing 5, and the holding sleeve 14 is provided with a cam surface 15. When in the holding state, this cam surface 1
5 presses the axial ear 10 of the housing 9 of the locking element,
The axial movement of the tool 1 inserted in the tool housing 5 is fixed, at which time the locking element 8 is pushed into the recess 4 of the insert shaft 2. When the holding sleeve 14 is rotated,
The cam surface 15 moves away from the ear tab 10. As a result, the ear 1
0 has radial play and can escape in the radial direction, which allows the insert shaft 2 to move freely again.

In the embodiment of FIG. 1, one semi-circular recess 4 is provided, but two or more recesses 4 can be provided in the insert shaft 2. When two or more recesses 4 are provided, it is preferable to provide the recesses in pairs at positions diametrically opposed to each other. In such a case, a plurality of, for example, two or more locking elements 8 are provided in a pair in the tool housing portion at positions diametrically opposed to each other, and similarly held as shown in the drawing. It is also possible to move axially together.

FIG. 2 shows a second embodiment of the insert shaft 2 of the tool 1 according to the invention. In this example,
The transmission side surface 31 is provided on the raised portion 3 extending in the axial direction. In the tool accommodating portion (not shown), the opposite side surfaces corresponding to the raised portions 3 are formed by grooves having a trapezoidal sectional shape and extending in the axial direction. A circumferential annular recess 4 is provided around the insert shaft 2. This annular recess 4 has the advantage that it is not necessary to consider the angular position of the recess 4 in the insert shaft 2 when inserting the tool into the tool housing. The angular position in which the tool can be inserted into the tool housing depends only on the positional relationship between the ridge 3 of the insert shaft 2 and the corresponding groove of the tool housing.

Ridge 3 with transmitting sides in the illustrated embodiment
Is not provided up to the insertion end 16 of the insertion shaft 2. This insertion end 16 has a circular cross section. The tool housing is provided with a ring-shaped packing which encloses the area of the insertion end 16 of the insertion shaft 2. This added packing prevents dirt in the area of the striking work of the hand tool device from entering along the ridge 3. It is also possible to terminate the groove at the insert end of the insert shaft by means of a tool having a rotation transmitting part in the form of a groove configured as shown in FIG. In this case too, the insert should have a circular cross section so that an additional seal can be fitted. Particularly when an indentation formed as an annular groove on the outer peripheral surface is provided adjacent to the insert end, an additional area is provided in the front region 17 of the insert shaft 2 in the working direction of the tool, in particular in the middle of the front part of the insert shaft. It is preferable to provide a seal. The depression is present in the opening area of the tool housing when the tool is inserted. The transmission side can also be provided in the front region of the bayonet shaft. This facilitates the close fit of the circular insert 16 with the additional mud seal. The introduction of impact energy can be optimized without having to consider the arrangement of the transmission flanks. The length of the twisted portion, defined as the distance between the transfer flank and the tool tip supporting the blade, is reduced.

FIG. 3 shows a cross section of another embodiment of the insert shaft 2 of the tool 1 according to the invention. This cross section is a cross section in an annular recess provided in a ring shape around the insertion shaft 2. In this embodiment, the transmission side surface 31
Is provided on the raised portion 3. The transmission side surface 31 makes an angle α with the radial plane R of the ridge 3. Preferably, this angle α has a value of 15 ° to 16 °. As a result, the force component introduced by the torque transmission from the corresponding side faces of the corresponding shape of the tool storage portion is distributed to those extending at right angles to the force transmission side face and those extending parallel to this transmission side face. , Produces a favorable centripetal effect. This centripetal action is also caused by providing the second side surface forming an angle β larger than the angle formed by the transmission side surface 31 with respect to the radial plane R of the ridge 3 on the rotation direction side of each ridge 3. When viewed in cross section of the bayonet shaft, the ridge 3 has an asymmetrical sawtooth shape. Although the embodiment shown in FIG. 3 shows a ridge 3 extending in the axial direction, it is also possible to provide an asymmetric groove in the insert shaft, in which case the tool receiving part engages with a correspondingly shaped transmission ridge to work together. To do so. In this case, the second side surface in the rotation direction follows the transmission side surface.

FIG. 4 shows a cross section for explaining the torque transmission of still another embodiment of the tool 1 according to the present invention. Similar to FIG. 3, this cross section is a cross section in an annular recess provided in a ring shape around the insertion shaft 2. The transmission side surface 31 has a rotation transmission groove 3 whose outer contour is sinusoidal. Similarly, the tool accommodating portion has a cross section of a sinusoidal cross section having a corresponding structure. The shapes of the opposite side surfaces of the tool accommodating portion and the groove of the insertion shaft of the tool are such that the engagement between the insertion shaft and the portion engaging with the insertion shaft has a sinusoidal contour. The transmission side surface and the opposing side surface of the tool accommodating portion formed in this way are present without any shear stress. This reduces frictional losses and keeps the wear of the transmission side of the insert shaft and the opposite side of the tool housing considerably less. Also, the occurrence of cracks is reduced. The shape of the sine curve can be changed, for example the sine curve can be flattened so that a tool inserted into the tool housing creates a dead space. The dead space functions as a mud pocket and can contain dirt. The sinusoidal shape can also be modified to guide the tool into the tool housing. In the embodiment of FIG. 4, the rotation transmitting groove has a sinusoidal contour. It should be understood that this sinusoidal outer contour can also be provided on the raised ridge.

In the embodiment of the tool shown in FIGS. 3 and 4, an odd number of opposite side surfaces of the insert shaft and the transmission side surface of the insert shaft are provided, respectively. For bayonet shafts with a diameter of about 10 mm or less, it is preferable to provide five transmission flanks 31 (see FIG. 3) or corresponding opposite flanks. For bayonet shafts with a diameter of approximately 10 mm to 15 mm, it is preferable to provide seven transmission or opposite sides. In the insertion shaft having a diameter of about 15 mm or more, the number of the rotation transmitting side surface 31 or the opposing side surface of the tool accommodating portion is 11
It is preferable to use individual pieces. Due to these numbers of transmission flanks or of opposite flanks corresponding to this transmission flank, the tool region provided with the transmission flank of the insert shaft of the above-mentioned diameter is structurally sufficiently stable. At the same time, maximum torque transmission can be maintained for the transmission side in the unloaded state. The odd number of transmission flanks has a positive effect on the dismantling movement of the tool in the drive. The shape of the illustrated embodiment of the transmission side surface and the axial fixing method, and the number of the transmission side surface and the opposing side surface can be arbitrarily combined.

According to the configuration of the tool and the tool accommodating portion of the hand tool device according to the present invention, it is possible to increase the torque transmission side surface assigned to the insertion shaft. For axial fixing of the tool, it is only necessary to provide the insert shaft with one small recess, which is provided in a very small area of the insert shaft. All the remaining area of the bayonet shaft can be allocated for torque transmission, more than in known torque transmission devices.
Greater torque can be transmitted to the tool. Since the recess is relatively small, there is less loss of strength in the tool in the recessed area of the bayonet shaft. Axial movement of the tool inserted in the tool housing within the limited range is still possible.

[0027]

According to the present invention of the tool and the tool accommodating portion of the hand tool device, the tool is prevented from being imperfectly inserted into the tool accommodating portion. On the other hand, from the tool of which the position of the mechanism is known and the tool accommodating portion related to this tool, the tool area provided with the transmission side surface and the area where the tool is fixed in the axial direction are not made the same configuration. The insertion of the tool into the tool housing is simple and the tool can be inserted at different angular positions depending on the number of recesses in the insertion shaft. The formation of the recess on the insert shaft of the tool is very simple and can be formed, for example, by cutting or cold deformation, in particular by cold rolling. These forming methods are simple, low in cost, and mass production of tools is extremely advantageous.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a tool and a part of a tool accommodating portion of a first embodiment of a torque transmission device according to the present invention.

FIG. 2 is a partial side view of the insert shaft of the tool of the second embodiment of the torque transmission device according to the present invention.

FIG. 3 is a cross-sectional view of the insert shaft of the tool of the third embodiment of the torque transmission device according to the present invention.

FIG. 4 is a transverse sectional view of the insert shaft of the tool of the fourth embodiment of the torque transmission device according to the present invention.

[Explanation of symbols]

 5 Tool 2 Insertion Shaft 3 Groove 31 Rotation Transmission Side 4 Depression 5 Tool Housing 6 Opposite Side 7 Fixing Device 8 Locking Element 9 Housing 10 Prong 11 Outer Side 12 Notch 13 Groove 14 Holding Sleeve 15 Cam Surface 16 Inserting End Part 17 front area

Claims (12)

[Claims] 1. A transmission side surface (31) having a tool (1) that can be inserted into a tool accommodating portion (5), and an insertion shaft (2) of the tool (1) provided with an axially extending transmission side surface (31). (31) is provided in the tool accommodating part (5) so as to engage with the opposing side surface (6) formed corresponding to the tool accommodating part (5) so that the tool (1) is held. In a torque transmission device in which a device (4) which engages with a fixing device (7) and operates in association with each other is provided on the insertion shaft (2), and which allows the tool to move in the axial direction within a limited range. The device (4) provided on the insert shaft (2) of the tool (1) is provided with at least one recess, which recess is provided corresponding to the tool receiving part (5) in the radial direction within a limited range. Movement and axis within a limited range The tool (1) is engaged with at least one locking element (8) capable of directional movement for interlocking movement, and the axial movement capacity of the locking element (8) within a limited range. A torque transmission device, which is capable of moving in the axial direction. 2. Torque transmission device according to claim 1, characterized in that the recess (4) of the insert shaft (2) is provided axially extending and the locking element (8) is likewise axially extended. . 3. The insertion end (1) of the insertion shaft.
6. The recess (4) in the front area (17) of the insert shaft (2) at the insert position of the tool (1) in the opening area of the tool housing (5) opposite to 6). Alternatively, the torque transmission device according to item 2. 4. At least two recesses (4) are provided, each of these recesses being semicircular, and equidistant from one another in the circumferential direction of the insert shaft (2) of the tool (1). The torque transmission device according to claim 1. 5. The torque transmission device according to claim 1, wherein each transmission side surface (31) is provided with a recess (4). 6. The torque transmission device according to claim 1, wherein the recess (4) is provided along the circumference of the insertion shaft (2), and the recess is formed as an annular groove. . 7. The transmission side surface (31) provided on the insertion shaft (2) is constituted by a ridge or a groove (3),
7. The transmission side surface according to claim 1, wherein the transmission side surface extends substantially perpendicular to the outer surface of the insertion shaft (2) and the transmission side surface is provided with a recess (4) or an annular groove. Torque transmission device. 8. The locking surface of the locking element (8) which engages with the annular groove is shaped to fit the cross section of the annular groove so that the locking surface abuts at least two ridges or grooves. The torque transmission device according to claim 6 or 7. 9. Transmission side (31) of the ridge or groove (3) with respect to the radial plane (R) of the ridge or groove (3).
The angle made by (α) is about 15 °.
The torque transmission device according to claim 7, wherein the torque transmission device has an angle of about 60 °. 10. The ridge or groove (3) is provided with a second side surface (32), the second side surface (32) transmitting to the radial plane (R) of the ridge or groove (3). The torque transmission device according to claim 9, wherein the torque transmission device forms an angle (β) larger than that of the side surface (31). 11. Torque transmission device according to claim 7, wherein said ridges or grooves (3) are provided on said insert shaft (2) such that the outer contour of said insert shaft (2) is sinusoidal. 12. The insertion shaft (2) is provided with an odd number of transmission side surfaces, and correspondingly, the tool housing (5) is provided with the same number of opposing side surfaces, and when the insertion shaft has a diameter of about 10 mm, 5 Provided with one transmission side (31) or opposite side (6), the diameter of the insert shaft is about 10 mm
7. Approximately 15 mm with 7 transmitting side surfaces (31) or opposite side surfaces (6) and 11 or more inserting shaft diameters greater than 15 mm with 11 transmitting side surfaces (31) or opposite side surfaces (6). 11. The torque transmission device according to claim 11.